Two-Pipe vs Four-Pipe: Heating Reality Check

Two-Pipe vs Four-Pipe: Heating Reality Check

Four-pipe gives you simultaneous heating and cooling. What the datasheets rarely put side by side is what it costs the heating coil. Pick a model and your climate, and see the real numbers — then get a recommendation, not a default.

All figures are manufacturer-tested at high fan speed. Two-pipe runs hot water through the full three-row coil; four-pipe adds a separate small heating coil (3+1 rows), which buys independence and costs heating surface. Airflow and sound are identical between the two — only the coil and pipework differ. This tool is a decision aid; confirm against your design conditions with Koven Air engineering.

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